Look at schematics... its sectors... we merge them in personal plots size 1-9 sectors. It depends of needs and etc. Also it gives that symetcical-assymetry like in real city... some roads goes from end to end, some deadend and etc.
We have 25 cityzens at this moment... and 3 join next week, they preparing bricks and etc... That city is planed for 45-55 active people.
I can say that we used up near to 80 000 bricks in AD. Its possible to calculate real q-ty but it takes time

So to see size of work you need plan and calculations...